What changed in the new version that stopped automatic emailing of PDF invoices?
No changes has been implemented in BUSY regarding E-mail with invoice as PDF attachement. Please check the following step to share invoice in attachement with e-mail:
Step 1: Open company in BUSY
Step 2: Go to Administration tab and click configuration option
Step 3: Click on E-mail Configuration
Step 4: Select PDF Attachement option in send report as section
Step 5: Save the configuration